Induction-meter.



R. C. LANPHIER.

INDUCTION METER. APPLICATION FILED 111111.30, 1011.

Patented Nov. 28, 1911.

3 SHEETSSHEET 1.

R. 0. LANPHIER.

INDUCTION METER.

APPLICATION FILED MAR. 30, Hill.

Patented Nov. 28,1911.

3 SHEETS-SHEET Z.

R. U. LANPHIER INDUCTION METER.

,APPLIOATION nun) MAR. 30, 1911;

Patented Nov.2s,1911

3 SIEETS-SHEET 3.

. a r W .5, l mm T 51: f i y w p a Q J. r g

UNITED STATES PATENT OFFICE.

ROBERTO. LANPHIER, OF SPRINGFIELD, ILLINOIS, ASSIGNOR 'IO SANGAMO ELECTRIC 7 COMPANY, OF SPRINGFIELD, ILLINOIS, A CORPORATION OF ILLINOIS.

INDUCTION-marlin.

Specification Letters Patent.

panying drawings.

This inventlon rvel ateatoinduction meters 3 of. the type "employing the principleiof the r V split phase rotating field,"and it hasifor its object to provideiajnewland improvedcon;

struction' and arrangement of lparts'fas here' inafter pointed out; In the commercial use of inductionfmeters,. i t is quite often neces? sary to replacekshuntior' seriesjcoilsl: and .itv is one-of; the objectsof ithisinvention to provide a'construction which shall permit of: the ready "removin and replacing of such coils. In'meters o this t e, it is usual to.

employ permanent f dampmgflor' braking magnets, which'must of course be main:

tained of'constant strength if the meter is to continue to measure accurately. Care must therefore be taken to guard these magnets against .the demagnetizing effect of a very heavy field created by-the series magnet upon I the passage of an extraordinarily a heavy current through the series coil due to a short circuit or other cause.

It is oneof the objects of this invention to prevent,--by the arrangement of the field structure itself,and without the assistance of any special shielding device, the demagnetizing effect of heavy fields produced by short circuits or otherwise.

It is another object of this invent-ion to improve the construction of the parts so that I am enabled to place the field magnets in. closer relation to each other-about the periphery of the armature, thus securing a greater reaction between such fields and consequently securing a greater'torque.

It is another object of this invention to improve the construction and arran ement of meters of this class in sundry detai s hereinafter pointed" out. i

The means by which I'have accomplished, these objects are illustrated in the drawings.

and hereinafter specifically described.

That which I believe to be new is set forth in the claims.

Application fllcd larch 30, 1911. Serial as. 817,904.

2 is a vertical section on line 22 of Fig. 1'; Fig.3 is a view of the inside of the baseplate with the grid, theparts supported by it, and the front portion of the meter re-' moved; Fig. 4 is a view of the supporting grid attached to the base-plate and seen rom the inner side or side which .faces the inner surface of the base plate shown in Fig. 3; Fi 5 is a diagrammatic view of a side elevation of the working parts of the meter; 6 is a. diagrammatic view showing the partsshown in Fig. 1, 'viewed from ing magnets removed; and 'Fig. 7 is a diagranunatie top or plan 'view of the parts SllOWlLiD Fig. 5 with the disk broken away.

and'with the windings and coil connections omitted;

Referring tothe drawings,-10 indicates the base or backframe of the meter. 11 indicates a coilmounted u. on a core 12 r e inovab'l secured 'to said p ate 10 and pref- I ade up of a number of thin plates erabl suita ly connected together, each of said plates being stamped out in substantially a recta -ular form as indic'atedin Fig. 3.

Patented Nov. 28, 1911.

the front or right-hand side, with the damp- The coil 11 contains a large number of turns of fine wire, said coil being connected across the circuit as indicated in said figure. As shown in Fig. 1, the ends of saidvcoil. are electrically connected to bindingposts '1314, the latter of which is connected electrically by awire 15 to a binding-post 16.

The-two poles of the magnet are'indicated by 17 and 18. The poles areclose together, leaving just sufficient clearance for the free rotation of the disk armature hereinafter described.

19 indicates a support or grid which extends across the meter parallel with the base 10, being spaced a proper distance from said base 10 by means of posts 20 formed integral with the base 10, or otherwise suitably secured thereto, to the free end of which the grid 19 is secured, as byscrews-20.

21 indicates a coil mounted upon a core 22 suitably secured to the grid 19 and preferably made up of a number of thin plates suitably connected together, each of which is stamped out in the'shape-of-a U. The coil 21 consists of only a few turns of coarse wire connected in series with the main load circuit. As shown in 2, the coil 21 is made in two parts, one upon each arm of the core 22. The ends 23-24 of the coil 21 are J in use connected respectively to the bindingpost 13 and a binding-post'25. The poles of the laminated core 22 are indicated by 28 indicates the disk armature of the me a ter, formed of aluminum or other suitable material, mounted'upon the shaft 29, whichis of-any approved'type, and is carried by brackets 4041 projecting from the outer 1o 'face of the 'grid l9. The disk, whose shaft is mounted on the outside of the'grid=19, projects through a suitable slot therein, as 19, as is Best seen in 'Figs. 1 aud t.

30 indicates one "of the two permanent '15 damping magnets between which the disk 28 rotates, and which is carried by suitable brackets,-as- 42,- projecting .from the front face o'f thegrid l9.

31-indicates a "return plate suitably se- 20" cured to the 'supp0rt-4landpreferably made up: of ainumber of thin plates suitably connec'ted'together; each of which is stamped out in the 'shap'eiof a U. *The ends 32-33 of the' returnjplate 31 are locatedsdirectly- ,.on-the oppositeisideofthe disk 28' from the poles 2tfr27o f-'the series magnet, as shown- 1n F ig. 2: ll} fl It'lwill' be under-s 'tha withithe grid 19 placeduponthe baselO with-the surface p30 showniin Fig; 2 facing said base" '10, the disk '28; will enterthei spacebetweenf the poles 17; "I and--18 of th'e=j-shul1t magneti the ole 1.7

. 32 33 of 'thelreturn plategand the pole 1S coming :betvveen-Lthe 'pQIeS 26 +27 'of the series magneg'i-all as-shown ix'i Fi s. 1 and "2 'and .as -shown diagramm'atically'in Figs. 3, "-4 and"5.1g'

The voperati on of is 40 well understood iby-those skilled in the art and need not be,describe'd herein. It is bea lieved to" be sufiicient to point out that the interpositiowof the laminated return plate between the electromagnets and the permanent damping magnets, with the'laminations'vertical, to the plane of the disk in afl curve eorrcspomling substantially with the curves of line of force'ln a spreading held produced hy.the series magnet, is elleetive to cause such magnetic field to be taken up be aeeomplished if the return plate were not of curved or U shape. This is of great imi portancv, since it enables me to obtain the maximum elieet 0t interaction between the understood. a

While it will beunderstoQd that-a difi'er coming betweeni-and'iembraced by at e ends field produced by the" series magnet ofone phase and the field of adififerentphase produced by the shunt magnet, as will be readily ence in phase is produced in the coils 11 and 21 by the construction of the-coils -them-- selves, 'one being of a greater number of turns offine wire and the other being of 'a few turns of coarse wire, I do not limit fiiyself to attainingthe difierence inphase necessary for the proper operation ofthe meter by thisuieans, except as hereinafter claimed.

- It will he'seen from the above description that I have produced an induction motor meter having a number of advantages, both structural and electrical. By-reason of the 'construetioashown I am-enabledto useta shunt magnet with 'asingle air-gap embrac mg the plate close to its periphery and, therefore,as far as possible from the center of the plate radially and operating to the best advantage, coupled; with alseriesmagnet which, with its, return plate, has two airga'ps,'.one 'upon each side of the poles of the series magnet, and also lying-close thereto,

5 and therefore most etfective for interaction therewith and also at a. maximumradiu: from the center'of the disk; at the same timt thecurved, bent or general U-shaped returr plate-for the series magnet enables it to em race the mass ofone of the poles of tilt skunt magnet so that its ends-lie'over th 'e' ds of the series magnet and close. to tlu poles of the shunt ma net. The curve structure, therefore, of t is returnv plate i the means by whichl am enabled, to gain the electrical advantage of having. the pole of'theseries magnet operating at the sam radial distance on the armature as the pole -of the series magnet and close to the mass 0 the poles of the series magnet. I By con structing this return plate of strips fan tened together, whose laminations are vei tical tq'the plane of the disk, and by givin it 'a general bend or U shape so that it ])l'( jects well out from thelields of the serit magnets toward the permanent magnets, obtain a constri'ietion which causes the ri turn plate to absorb the spreading lines 1 'force arising under short cireuitiug'eoml tions where there is a great and sudden llu through the magnet, \vhir-h would otherwi: spread out past; the prrmanent'maguets at: seriously atl'eetand impair their nutgnetisi \vitlumt the interposition between the-cue giziug magnets and the permanent. inagnp of any exterior structure for that purpose and this results because the spreading liu )f t rz'-(' under short circuit conditions \v naturally tend to travel along the rurw lin s defined by the lalninations of the I turn platef As the front oi the return pin is u'cll'tforwm-d of the plane oi the st-ri v brackets thereupon. I have produced a small and. compact induction meter, and, as

.the back-plate by suitable-mountings, and

; by mounting upon thisgrida series magnet and its connections, the armaturegnd-armature. bearings, and the permanentfmagnets, I have devised a structure which may be readily takeniapart for purposes-of repair, is readily accessible, and in which the weight of the erma'nent magnets, the series measuring: e ements'and the return plateare all carr ed upon the grid and upon suitable has been said, one'that canbe' readily taken apart and re aired and in which the parts are all readi yiaccessible. It also 'enables me to produce-a type 'of meterin which, if

the shun't or potential coilbreaks down or burns out on accountof abnormal line con ditions or accident, the replacementv of tht coil is an easy andv convenient matter. a By simpl removing the trout .grid andits an tache parts the shunt magnet as anentirety ma be easily removedand anew core and coi substituted for it.

I have shown and described the return.

plate of the series-magnet, as in curved or U shape. Of course it will be understood that I do not limit myself 'to a true continuous curve of the type shown, but use the word curve only in its g'eneral sense as is curved or bent or shaped so t at its ends, which are in register with the poles of the series magnet, may at the same time embrace i so that its front-t between them the pole of the shunt magnet, wh e between its ends the return plate exten 3 outward away from the magnetic poles at is, the side away from the pbles lies well forward of the poles of the setib'sand shunt magnet. I therefore use the \vordcurved in a broad sense as applying to a return plate vhaving substantially this construction, whether it be a con- Leo tinuous curve'or some other substantially equivalent shape.

That which I claim as my invention, and

desire to secure by Letters; Patent, is,-

1. In an alternating current meter, in com- ,bination, a rotat-ive metallic armature, shunt and series wound electro-magnets in cotiperative relation, one of said magnets having a single air-gap embracing the edge of said armature at a maximum radius, the other haying two air-gaps embracing the armature on each side of the air-gap of the first maglate which net and at a maximum radius of the disk, said second magnet having a return structure embracing the mass of said first magnet betwecn the ends of said return structure.

2. In an alternating current meter, in combination, a rotativc metallic armature, an electro-magnet having windings adapted to be connected in shunt with an alternating current circuit and having a single air-gap embracing the edge of said armature at a maximum radius thereon, a second electromagnet having windings adapted to be connected in series with an alternating current circuit and having two air-gaps embracing said armature on each side of the air-gap of, said shuntmagnet and at a maximum radius of the armature and provided with 'a return magnetic structure embracing themass of said shunt magnet between the ends of said return structure.

3. In an'alternating current meter, in combination, a rotative metallic armature, an electromagnet having windings adapted to be. connected in shunt with an alternating current circuit and having a single air-gap embracing the edge of said armature at a maximum radius thereon, a second electromagnet having windings adapted to be connected in'series with analternating current circuit and having two air-gaps embracing said armature, on each side of the air-gap of said sllunt magnet and at a maximum radius'of he armature one portion of said second magnet being a return magnetic structure consisting of curved plates with their laminations vertical to the plane of v the armature and bent with their concave side toward said magnet and embracing the mass of said shunt magnet between the ends of said return structure.

4, In an alternating current meter, in combination a'rotative diskarmature, a magnet adapted to be energized by current from an alternating current circuit and embracing said disk between its poles near the periphery ofsaid dislg, a second magnet adapted to-be energized by current from an alternating current circuit and having its poles on one side of said disk upon each side of one of the poles of said first magnet and near theperiphery of said disk, a return-piece for said second magnet on the other side of said disk and extending from one pole to the other of said second magnet in a curve concave toward said first magnet poles.

5. In an alternating current meter, in comone of the poles of said rst magnet and s-swim! 'tively hirge num f ma ma I timulus grof, said. first nmg'n'et and neii'r the'p'eriphery 7 .of said;.disk, '-energizing"-ivinding for said i stmmdmagnet consisting o'f u' relatively siuall inimberi ofjturns 50f relatively large 40. wjreadaptedto be connected ins'eries with nearthe periphery of'saiddisk; a braking magnet. in operative reletion-withsaid disk armature; a return piece. for"said -second v nia'gne'ton the opposite sideof the disk from- 5 'the poles thereof 'between saidfirstmzignet and said braking niagnet and. curved or bent i With its. concave sidetoward said first Ina-g ,v

netpoles..-

I (ikIn' an "alternating current 'meter -in,

.10 combination, -a rotative disk armature, a.

iuagnetjei iibracing' said disk between its polesflncar the periphery of 'said disk, windugs fdr said inagnetfadapted to be connccted'ih'shunt across an alternatingicur: rent circuit, a second i magnet halving its- POIBSYZQUIOHB" side of said disk upon, each. side of one'polef-of said firstmagnetand near the periphery? of. said disk, windings for-said magnetndented to be connected in series with anf-elternatin'g current. circuit, a return-piece; for said; second magi cuit a return piece for said second mag l" disk.betiveen fthe lpoles thereof .and ekten i ring (in; concave toward-said i first 25.1'nagne't; j p 1 $975111. an ltematmg'currentgmeter, n.

V combination 'i'j-a. retetiredisk armature; 'anagii'et e m racing. said ,diskvbetween its the; per phery ofs aid "disk,'ivind across imeuernae g .vc iiifrcntfcircuit, s. at having ts pics. on one sideof upon ehchsi e-i'of -onel..pp1e piece an alternating current circuit, a return piece for said second magnet extending" between.

the poles thcreo'f on the other sidei'of the f disk therefrom and bent to present its concaa'e side toward said, first mugnetaud -its convex side toward the ciznierof the disk.

In',. an alternating,curirentimeter, in muubinution; a. rotativwdisik armature, a uingn'etembracing-said disk between its 60, "polcs-neurthc peripheryof said disk, wind mgs vfor'said magnet consisting of a -rele- Ativoiylarge number of turns of relatively V line wire adapted to becomicctediin shunt acrcss alu uiternaiing current'circuit, a sec- 65 um] maglletJun ing its nice on one side. of

said disk upon each si e of one pole piece of said first magnet vand near the periphery of sald li:-'l;i. energizing windings for said second magnet consisting of a reletivelysi'uull .numhor'of turns of relatively large wire ada'pted to he counwicd iu series with an allvrmdmg current circuit, a returns.

; piece 'lor said second ilmgnct extending be- -t\\"von 'lho plnlcs thereof on the othcr'side of tlieklisk ill i'flfi'Qlll and bent to present itsgetfconsisting; of el'rela I r of tui-ns of. relatively finewrii' ndiiptedf to be] connected in shunt.

concave side toward said 'firSt'megnet and its convex side, toward the centerof the disk, a d a braking magnet in operative 'relationto said diskbeyond the convex side oil-said curved return piece.

-'9. In an electricity meter, in combination a base, {in electro-magnet removably secur to said base and adapted to be connect/ed with an electric circuit, a grid, means for remoyably sccuring'said grid to said base at a suit-able distance therefrom, a spindle cerried by said grid, a disk armature mounted on-said spindle, a second electro-magnet carried by said grid andin c'oiiperative relation with'said armature and adaptedto be connected with an electric circuit; said spindle, disk and second elect-ro-magnet being so mounted upon said g'ridlthat when the grid is placed in posit-ion the said disk and electro magnet arebrought into .coiiperative relation with said'first magnet.

- 10. In an electric motor meter, infcomsin le' air-gap end-adaptedto embrace a said grid 'to said hase at a suitable distance fliercfrom," a spindle carried by said grid, a

disk armaturemountedon said spindle, a

-U-shaped electro-mugnet adapted to be con nectcd no; iurelectriccurrent and carried by said grid i'vlth its poles facing one side -of said disk near the periphery thereof, a return'p cce carried by saidgrid on the -other side of said disk, said spindle, disk,

lbination, a base, an elcctroqna-gnet remov-',' .:a bly supported on said base'and having a.

, n jdis armature, said magnet being adapted "to be connected with an elect-riclcircuit, a grid, means for removably'seciirin magi-lot and return piecebeing so mounted upon said. grid that when the same is placed '10s; the disk will lie in the air-gap 'betweenthe in position ontlie base the periphery of poles of said first-magnet and the poles of 'saidsecond magnet will lie upon each side of the polar mass of said first magnet on one side of the disk and the polar mass of suidfirstmagnet on the other side of the disk. will .be embraced between the ends of the return piece.

11. In an electric motor -meier,' in. 00111- bination, abase, an cle'ctrdmagnet removably'supported on said base and having a sing-lo air-gap and adapted to embrace a disk armature, said magnet being adapted to be connected with an electric circuit a grid, means for removabl" securing said grid to said base at a suitab e distance theremeiosis consisting of laminations vertical to the plane of the disk, said spindle, disk, electro- "magnet andreturn piece being so mounted on said grid that when the same is in position on the base the periphery of the disk will lie in the air-gap between the poles: of said first magnet, the poles of said second magnet will 1e upon each side of one pole of said first ma et upon one side of the disk- QJMG en 5 of said return iece will ne upo'n each side of the other po e of said ffirst magnet-on the: other side of said disk.

concave side facing said first magnet when in position andwith its ends lying upon each side of the polar mass thereof, a ratio .50 luble shaft supported on one side ofisaid grid by suitable brackets, a metallic'disk' 14.111 an alternatii'lg current meter, in 60 combinatioma base, a magnet removably secured thereto and having a single air-gap and adapted to be connected to an alternat- 12. In an" alternating current meter,; in eombinatign a base, a magnetlremevably se- HfidlfeiilW and. having a single air-gap I adapted to be connected to an alterso and sai gniti'n current circuit, a grid, 'means for re- "sl m l securing said grid to said base at Ii-"suite le distance therefrom,ia -U-shaped fzo electro-magnet supported by said grid and adapted" when sai grid is placed in position, to have its pole pieces c ose by the side ofthe'poles of said first magnet, a return Qplate'ffor' said second magnet supported by grid, a Ievoluble shaft su ported Lon one side of said grid by suitab e brackets, a7"; etallic disk armature supported by said shaft and having its periphery embraced by i the airap'sbetween said second magnet return late and adapted, when said grid is placed in position on said base, to also have its periphery lie within the air-- gap of said first magnet. 13. In: an alternating current meter, in

' combination, a base, a i nagne t removably secured thereto and having a s ngle air-gap and adaptedto be connected to an alternat ing current circuit, a grid, means for re- -movabl securing said grid to said base at 40 a suita le distance therefrom, a U-shaped electro-magnet su rted by said grid and adapted, when said grid is laced in position, to have its pole pieces 0 ose by the side for said second magnet supported by pole of said magnet to the other with its oi the poles of said first magnet, a return l g (1 grid and extending in a curve from one ing current circuit, a grid, means for removabl securing said grid to said base at a suite is distance therefrom, a U--shaped electro magnet supportedby'said grid and,

adapted, when said grid is laced in position, to have its pole pieces 0 ose by the side of the poles of said first magnet, a return plate for said second magnet supported by said grid and extending in a curve from one pole of said Ina-mist to the other with its concave side facing said first magnet when in position and with its ends lying upon each side of the polar mass thereof, a revoluble shaft so. ported on one side of said grid by suita .e brackets, a metallic disk armature supported by said shaft and havin its periphery embraced by the'airgaps between said second magnet and said return plate and adapted, when said grid'is ducted in position on said base, to also have, its periphery lie within the a1rgap of saidfirst magnet, and a permanent magnet also suppdrted on said grid upon. tlriecpposite side thereof from said secondnemednaggict and embracing said dist-t in the air-gap tween its poles.

H ROBERT C. LANPHIER.

' Witnesses:

CHAS. G. lie-seems,

An'rrttm H. ELBHt'iFF. 

